Number of busy executors and how it changes over time.
Number of {@link hudson.model.Queue.BuildableItem}s that can run on any node in this node set but blocked.
Number of total executors and how it changes over time.
Updated every 1 hour. Keep data up to 4 weeks.
Updated every 1 min. Keep data up to 1 day.
Updated every 10 seconds. Keep data up to 1 hour.